Merchant Navy (United Kingdom)
The Merchant Navy (MN) is the collective name given to British civilian ships and the officers and ratings that man them. Merchant Navy vessels mostly fly the Red Ensign and the ships and ship's companies' are regulated by the Maritime and Coastguard Agency (MCA), a specialist agency of the UK Department of Transport.
Source: Wikipedia — Merchant Navy (United Kingdom) (CC BY-SA 4.0)